Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2004-08-09
2010-02-23
Nguyen, Steven H (Department: 2416)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S401000
Reexamination Certificate
active
07668158
ABSTRACT:
A packet voice switch60and method for its operation are disclosed. The switch comprises a network switching means, preferably implemented within its host processor78, that allows calls to be routed between a circuit-switched connection at circuit-switched interface74and either another circuit-switched connection at interface74or a packet-switched connection at packet-switched interface76. The network switching means selects call routing for calls based on a comparison of the current quality of service for the call over the packet-switched connection vs. the extra cost of connecting the call over the circuit-switched connection. Preferably, the comparison can be adjusted for call distance, the user's own quality of service preference, and current system load.In a preferred embodiment, switch60communicates with a similar packet voice switch (handling the other end of the same call) in order to initiate a mid-call network switch that is transparent to the calling and called parties. This embodiment provides a guaranteed minimum quality of service for packet voice applications, and provides a reliable backup in case of a packet data route failure.In a second embodiment, users may initiate network switching themselves if they desire higher quality, by entering an appropriate sequence on their DTMF keypad.
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Bob Emmerson, “Internet Telephony”, May 1997 BYTE, p. 3.
Cisco Technology Inc.
Nguyen Steven H
Rutkowski Jeffrey M
Stolowitz Ford Cowger LLP
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